Abstract: Iso-octanol was sulfated by SO₃ gas in a falling-film sulfonation/sulfation reactor,and the intermediate was neutralized by NaOH solution to get the product sodium iso-octanol sulfate.Structure of the product was characterized by means of FTIR.Factors that influencing the product yield were investigated and optimum reaction conditions were identified by orthogonal designed experiment as:dosage of iso-octanol 13.9 kg·h^-1,volume fraction of SO₃ gas 3%,reactor jacket cooling water temperature 20 ℃,reaction temperature of neutralization 50 ℃.Performance indices,such as surface activity,wetting power and foaming performance et al.of the end product are basically coincide with that of product purchased from market that was prepared by aminosulfonic acid method.

Key words: sodium iso-octanol sulfate, SO₃ gas, falling-film reactor, performance